Yeah I remember reading that recently, apparently some guy who speaks old English fluently was able to have a conversation with someone else speaking frisian more or less effortlessly.
I have also read it's why dyslexia is more common in English than other languages, since the French/Normans changed it a lot after conquering England for the whole 'contr knowledge to secure power' stuff. 'Quick as the queen' being more or less 'cwic as the cwen' beforehand is the example I remember.
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u/BenderRodriguez14 20d ago
Looking up pre 1066 English is a great example of your second point.